Calling device.



F. R. MGBBBTY.

CALLING DEVICE.

APPLIGATION TIL? ID FEB.2T,1908.

Patented Apr. 22, 1913.

l6 SHEETSS HEET 1..

a w N @E MR MW inventor: f )JQk;

- P. R. MGBBRTY.

CALLING DEVICE. APPLIOATION FILED 313.27, 1908.

1,059,944. Patented Apr. 22, 1913.

16 SHEETS-SHEET 2.

Attest: Entor:

P. R. MOBERTY.

GALLING DEVICE.

APPLICATION FILED FEB. 27, 1908. 1,059,944, Patented Apr. 22, 1913.

16 SHEETS-SHEET 3.

law.

Attest: Ind/ingot:

F. R. MGBERTY.

CALLING DEVICE.

APPLICATION TILED IEB.27, 1908.

Patented Apr. 22, 1913.

llflllllllllllllllllllll lllllIIIHi Attesi: Inventor:

F. R. MOBERTY.

CALLING DEVICE.

APPLICATION FILED FEB.27, 190s.

Patented Apr. 22, 1913,

16 SHEETS-SHEET 5.

P. R. MGBERTY.

CALLING DEVICE.

APPLICATION FILED 191313.27, 190s.

Patented Apr. 22, 1913.

16 SHEETS-SHEET 6,

Inventor: 6A l? 1-.

F. R. MQBERTY,

CALLING DEVICE.

APPLICATION FILED FEB, 27, 1908 Patented M1222, 1913.

16 SHEETS-SHEET 7.

F. R. MGBERTY.

CALLING DEVICE.

APPLICATION FILED r3327. 190a.

Patented Apr. 22, 1913.

16 SHEETS-SHEET 8.

A attest:

F. R. MGBERTY.

CALLING DEVICE.

APPLICATION FILED rmmv, 1908,

1,059,944. Patented Apr. 22, 1913.

16 SHBETS-SHEET 9.

Att est: 4 inventor; a! I Attest:

F. R. MGBERTY.

CALLING DEVICE.

APPLICATION HLBD'EEB.27, 190s.

Patented Apr. 22, 1913.

16 SHEETSSHHET 10.

Hill: I a 5 w AWWA 92 5? P. R. MGBERTY.

CALLING DEVICE. APPLIGATION FILED FEB.27, 190s.

Patentd 11151222, 1913.

16 SHEETSSHBET 11.

F. R. MOBEETY.

7 CALLING DEVICE.

APPLICATION FILED 2312.27, 19.03.

Patented Apr. 22, 1913.

16 SHEETS-SHEET 12.

1 I I VM. 3 /b// Inventor: 0. kW

' Attest:

F. R. MOBERTY. CALLING DEVICE. APPLICATION FILED IEB.27, 1903.

Patented Apr. 22, 1913.

16 SHEBTS-SHEET13.

Q rgrgiegtor:

P. R. MQBERTY.

GALLING DEVICE.

APPLICATION FILED FEB.27, 1908. 1,059,944.

16 SHEETS-SHEET 14 Arrest: Q Invento @wwJ m g pmflh;

Patented Apr. 22, 1913.

F. R. MoBERTY. CALLING DEVICE.

APPLICATION FILED FEB. 27, 190B. 1,05 9,944.

Patented Apr. 221913.

16 SHEETS-SHEET l5.

Attest: In ven tor:

@W/Q a P. R. MQBERTY. CALLING DEVICE.

APPLICATION FILED FEB-27, 1908. I 1 ,05 9,9 44. Patented Apr. 22, 1913.

16 SHEETS-SHEET 0 W @W m:

c To all whom z'zf mczg concern:

UNITED STATES PATENT OFFICE.

FRANK R. MGBEBTY, OENEW ROCHELLE, NEW .YORK, ASSIGNOi T0 WESTERN ELEC- TRIC COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

cALLInG DEVICE.

Specification of Letterslatent.

Patented Apr. 22,1913.

Application filed February 27, 1908. Serial No. 118,127.

Be itknown that I, FRANK R. McBnn'rr, a citizen of the United States,'residing in the. town of New Rochelle, in the county of lYestchester and State of New York, have invented a certainnew and useful Improvement in Callin Devices, of which the following is a in l, clear, concise, and exact description. p

My invention relates to a device for controlling the actuating circuits, of electrically controlled mechanism, such as that which is employed in effecting the interconnection for conversation of the telephones of a telephone exchange; and it is directed more particularly toward the provision of a calling device for controlling the operationof switching mechanism located at the distant end of a circuit with which the calling device is associated, for'thepurpose of causing the switching mechanism to act under the control of the calling device to connect the associated circuit with any one of a number of other telephone lines or circuits.

My invention has for its principal object the provision of a simple and efiicient calling device or controller of this character,

-which may be quickly and easily operated to gdvern the movement of the associated switching mechanism or automatic switch.

The' calling device of my invent-ion is of particular utility when employed in connection with the switching mechanism of a system which I shall hereinafter set forth in detail, and which has certain characteristics distinguishing it from the telephone systems of the art.

In the so called automatic telephone systems, as commonly practised it is the custom to provide at the central office of the exchange automatic switches upon which the lines terminate, and which are adapted to effect interconnection between various lines of the exchange, these automatic switches being controlled in their operation by means of'special calling appara-tus'located at each subscribers station and manipula'ted by theesnbscriber to cause the automatic switches at the central ofiice to com- -plete the connection he desires, These systems notonly necessitate the provision of special, and sometimes highly complicated,

apparatus at eachsubstation, which a paratus is usually expensive and also l able to derangement; but they also impose upon the subscriber the necessity of doing the of the calls for connection must be trunked,

that is, each call must be extended by means of a trunk line to a particular one of a number of groups into which the lines of the exchange are divided. The establishment of such a connection, therefore, involves the services of at least two operators,t-he operator who first answers the subscriber and obtains from him the number of the line with which he desires connection, and the of the trunk line through which connection operator who presides over the distant end is'made to the particular group in which, the called line is located. The trunking of a connection involves aconve'rsation between the 'subscribers operator and the trunk op erator, in which the trunk operator is apprised of the number of the line called for, and in turn informs the subscribers operator of the number of the trunk line over which connection is to be extended. This method of completing connection between the subscribers -lines not only necessitates the employment of a large force of operators,

but is also subject to objection arising from error in repeating the number of the line with which connection is desired, and hidesignating the number of the trunk linethat is to be employed in establishing the connection.

The system in connection with which the calling device of my inventionis particularly adapted to be employed aims to com-.

bine the best featuresof operation of the automatic system and of the manual system, and to eliminate the objectionable features of both. In accordance with the embodiment of this system which I have herein illustrated, and which I shall describe. the

substation equipment is of the usual char actor, and does not involve any special calling apparatus. The subscribers lines extend to a central oifice, where they are ter- -minated in such a manner that a call for connection operates a signal that attracts the attention of the operator. The operator is provided with switching means for putting herself into communication with the calling subscriber and ascertaining his wants; and also-with connecting means through which the line of the calling subscriber may be extended toa circuit over which his line, without any further effort on his part, and without requiring the services of another operator, may be brought into connection with the, particular line for which he is calling. The circuit over which connection with the called line is established, is provided with. an automatic switch which has access to connection terminals of the line with which connection is desired, and which isunder the out 01 of the calling device of my invention, whic is adapted to be manipulated by the operator who answers the subscribers call.

Uponreceiving the call of the callin sub scriber the operator sets the calling cevic'e and when she'has completed connection with the trunk line extending to the group in; which the called line is included, the automaticswitoh at the other end of the trunk operates under the control of the calling device to select and establish connection with the particular line with which connection is desired. In this way the work which in an automatic system is performed by the sub scriber himself, and which requires special calling apparatus at his substation, is, in the system with which the calling device of my invention is particularly adaptedto be used, performed by the operator at the central otfice; while the work of completing connection with a called subscribers line located in a particular group and at a point remote from the 'point Where the calling subscriber is answered, which work is in a manual system performed by a trunk operator in response to spoken instruction from the subscribers operator, is in this system accomplished by an automatic switch controlled, through the medium of the calling device of my invention, by the operator who answers the subscribers call. L

The'system which I shall describe involves a number of improved and novel. instrumentalities which may be used in this or in other systems. The automatic switch employed in this system is adapted to perform, under the control of the operator who answers the subscribers call, all the work incident to selecting, testing, connecting with, ringing and disconnecting the called line which a. trunk operator would perform under the verbal instructions of the answering operator; and the calling device of my invention operated by the answering operator is adapted to be set and controlled by that operator to govern 5 the movement of the automatic switch in performing-the various operations referred to above.

Briefly stated, the system in which the embodiment of my invention illustrated and described herein is particularly designed to be employed operates as follows. The act of the calling subscriber in taking his telephone for use displays a signal which leads the answering operator to complete connection with the calling line by inserting one of the plugs of a pair of connecting cords .into the associated spring ack on the switchboard. WVhe'n the operator has learned the number of the line with which the calling subscriber desires connection, she sets ing .device into operative relation with the automatic switch at the other end of the 'trunkline. As soon as thecalling device and automatic switch are brought into operative relation a local source 0 power associated with the automatic switch is made operative to drive, it, and the movement of the switch produces impulses that in turn serve to drive the calling device. The antomatic switch has a number of rows of stationary terminals wired to the lines that terminate on the spring jacks in the switchboard, and a number of'movable terminals that are caused to pass over the stationary terminals in the movement of the switch, each movable terminal being arranged to pass over a particular row of stationary terminals.

'nals are connected with the trunk line, none of them is normally in condition to engage the terminals of the row over which it moves, but the switch is provided with mechanism that acts under the control of the calling device to select a particular While all of the movable termione'or group-ot the movable terminals,

and bring it into position to engage the stationary terminals of its associated row. The

particular movable terminal selected depends upon the degree to which themovable terminalswhich all .move togetherhave been displaced from their normal or resting position when the selecting mechanism operates; so, inasmuch as the automatic switch ation of the selecting mechanism of the automatic switch at any predetermined point in its movement, and is thus able to select and make active any desired one of the movable terminals. The movement of the automatic switch is stopped by the operation or mechanism associated with the switch and actuated by another current change controlled by the calling device; and, as the eX- .selected a testing relay is brought into action. to prevent the trunk line from being extended to the selected line in case the latter is busy, and to transmit a busy signal to the other end of the trunk. It theline is not busy, connection with it is completed and ringing current is applied by means of a circuit which is automatically disconnected when the called sub criber nswers the call. The talking circuitof the trunk is at the same time completed at this end, and, as

the devices at the ot-herend of the'trun'l: line.

have operated in the meanwhile to discon nect the calling device and complete the trunk circuit at that point, the calling subscriber and the called subscriber are now brought into communication. During the use of their telephones, both subscribers have control of the usual supervisory signals before the operator. Vvhen they replace their telephonesthe operator disconnects, and the resultant change of current flow in the circuit oi' the trunk line causes the return of the automatic switch to its normal position.

In the system in which I have illustrated the calling device of my invention to be employed, the reciprocal control over each otherof the callingd-evice and the automatic switch, the "control of the called subscribers supervisory signal, the transmission of the busy signal if the line is engaged, and the telephonic communication between the subscribers are'all effected over the usual single pair of conductors. T he control of the calling device over' 'th'e' automatic switch to cause it to perform its-various operations of starting, selecting a particular movable terminal, select ng and connecting .with a" particularstationaryterminal, and returnin g tomorm'al "fposition 1's efi'ected through the medium of sjwitclimgmechanism at 'the automatic switch-end of the trunk, which 0 )erates at each-chan e of current flow roduced by'the callingdeviceto'shift the con-- trol or? the callihg device from one to the of the automatic switch} i The foregoing. is an outline of the system as a Whole in which, the calling device of my invention is particularly designed to be employed. In' order that a clear understanding of the operation ofthe calling device of my invention may be had, I shall fully describe the telephonic system in which I haveshown it to be used in the vices which cooperate with it in this system; but it. will be understood that the calling device toward which the claims of the present application are particularly directed is capable of beingadvanta'geously employed in organizations other than the particular one in connection with which it is here illustrated.

I shall describe the calling device of my invention, and the 'telephone system in which, in the present instance, it is employed, more in detail by reference to the accompanying drawings, wherein tion of the circuit arrangement of one form of telephone system in which the calling device of my invention may be employed? portions of the automatic switch being illustrated in perspective; Fig. 2 is a plan view of a form of calling device embodying my invention, and adapted to cooperate with the switching apparatus of my invention in .the system illustrated; Fig. 3, a planview of the calling device with the cover removed; Fig. 4c, a side elevation of the calling device with the outer casing partially broken away; Fig. 5, a vertical cross section on line 55 of Fig. 3; Fig. 6,'a perspective of the plate 'carrying one of the contact levers operated View of another of the plates with its associated switches; Fig. 8, a detail plan View of the controlling magnet of the calling device with its escapement mechanism; Fig.

nector switch, the switch carriage being shown rotated-off its normal position in ment of" the parts may be more clearly seen;

switch with its parts in the positionshown switch with its parts as shown in Fig.,'9;

13, a top plan view with the movable ,terminals of the switch in their normal position at the left hand extremity of their are of movement; Fig. 14, a sectional plan View on line 14:14: of Fig.9; Fig.- 15, a section on line. lit-15 ofFig. 9; 1'6,'a perspective View of the switch carriage, or movable element of the switch, carrying 'the movable terminals. with their associated pants; Fig. 17, a-perspective view of the other side ofthe switch carriage; Fig. 18, a

of some of stationary termipresent instance, together with the other deby the calling device; Fig. 7, a perspective 9, a front elevation of the automatic, con-- order that the construction and arrange-I Figure 1 is a diagrammatic representa- Fig. 10, a rear elevation of the automatic .in Fig. 9; Fig. 11, a side elevation of the Fig. 12, a top plan view of the same: Fig.

are mounted; Fig. 23, a top nals of the switch; Fig. 19, a detail of one of the latches-that holds the movable termi-' nal clear of the-stationary terminals; Fig.

20, an enlarged detail, partially broken away, of the interrupter segments of the switch; Figs. 21 and 22, enlarged detail views of the tripping and resetting portions of the automatic switch, Fig. 21 showing the relation between thetripping mechanism and the bank of movable terminals prior in Fig. 7, with a portion of the escapement wheel of the calling device, to illustrate the relation between the parts when the escapement wheel is in its normal position; and

Fig. 26, a top view of the interrupter segments.

Switch.--I shall first describe the automatic switch which is controlled by the calling device of my invention to perform the ofiice of a trunkoperator in establishing connect-ion with the called line. Thisswitch comprises primarily a number of stationary terminals mounted in a terminal block, a carriage or traveler carrying a number of movable terminals or brushes with means .for normally holding the movable terminals or brushesclear of the stationary terminals and for measuring the movement of the carriage, a tripping device for tripping any one of themovable terminals so as to bring it into position to engage the stationary terminals in the corresponding row, a resetting device for restoring the tripped movable terminal to its normal. position upon the return of the carriage or traveler, driving mechanism for causing the movement at the carriage, a magnet for controlling the operation oflhc driving mechanism, and a-frame to which all of the above mentioned parts are secured and by means of which they are supported.

The supporting frame consists of a base piece .9 to which two uprights s are secured by means of two lugs 5 These uprights are shown broken off at their upper ends in the drawing, as they may be made long enough to su port a number of switches 55 arranged one a ove the other. Above the switch S the uprights s are braced by means of a cross piece .9 The different parts of the switch are secured to the support in threegroups, any one of whlch may be detached from the support without dlsturbing the others. One of these groups includes the stationaryterminals 8 in their mounting block and one part of the interrupter which measures the movement of the switch carriage. The second group consists of the carriage or traveler carrying-the movable terminals 8 the other element of the interrupter, the -tripping mechanism, a cam switch associated with the carriage, and one element of the magnetic clutch by means of which the carriage is driven. The'third group comprises the power shaft and the other element of the magnetic clutch.

The stationary terminals 5 consist, in the present instance, of metal punchings, which may conveniently be of brass and have the form illustrated in Fig. 18. -These punchings are mounted in parallel rows in a'terminal block 8 of hard rubber, or like suitable insulating .material. The terminal block 8 is substantially semi-cylindrical in form, and for convenience in manufacture may be divided into twoor more-parts, as shown. The holes in the terminal block in which the stationary terminal punchings Inasmuch as the movable terminals that traverse the inner ends of the stationary terminals move across the ends and have a tendency to displace them in a horizontal direction, I cut the slots so,that the webs on the if 110 inner surface of the terminal block extend vertically, so as to support the ends of the terminals against horizontal displacement; while the horizontal arrangement of the webs on the outer surface of the terminal block supports the corresponding ends of the terminals against displacement in a vertical direction by the vertically extending wires or cables connected with the outer ends of the terminals. In the present instance, I have illustrated the switch as being provided with sixteen hun red and twenty stationary terminals arraiig d in thirty parallel horizontal rows having fifty-four terminals-in each row; and I have shown the terminal cylinder 8 as being divided horizontally into two parts, eachcontaining half of the terminals.

The terminal punchings s are preferably formed with shoulders s 'near their forward ends, as shown in Fig. 18, these shoule are placed may be formed in any convenient manner, but- I prefer to produce 

